CVE-2026-54247

Skipper is an HTTP router and reverse proxy for service composition. Prior to 0.26.22, Handler in dataclients/kubernetes/admission/admission.go passes the body of requests to the Kubernetes admission endpoint at :9443/admission directly to io.ReadAll(r.Body) without a size limit. An attacker with in-cluster network access and a valid Kubernetes client certificate can send a very large body that causes unbounded memory allocation and an out-of-memory termination of the Skipper process. The disruption is limited to Ingress and RouteGroup admission rather than pod creation or unrelated admission controllers, and Kubernetes normally restarts the process. This issue is fixed in version 0.26.22.

• CWE-770

• https://github.com/zalando/skipper/commit/c3d156c6caaefecc9a46774c0f9c3c70b97160b4
• https://github.com/zalando/skipper/pull/4053
• https://github.com/zalando/skipper/releases/tag/v0.26.22
• https://github.com/zalando/skipper/security/advisories/GHSA-cwxq-rc9x-2jvv

Published

Sep 14, 2026

Last Modified

Sep 16, 2026

Status

Deferred

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